docs: add POS Foundation implementation plan (1 of 5)

10-task plan covering multi-tenant infrastructure:
- Tenant DB provisioning from template (21 tables)
- PIN auth with JWT, rate limiting, lockout
- Permission system (owner/admin/cashier/warehouse/accountant)
- Audit logging (insert-only)
- Config: branches, employees, theming
- Migration runner for versioned schema updates

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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2026-03-31 01:16:59 +00:00
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